On Wednesday 20 December 2006 07:45, Steven Ellis wrote:
> Hans Verkuil wrote:
> > Hi all,
> >
> > I think it is getting time for people to start testing the ivtv
> > trunk from subversion. I've been running it for quite some time now
> > and it looks to be pretty solid. Ian Armstrong has added lots of
> > goodies in the framebuffer department (be sure to read the README
> > notes!), so that can use some testing as well.
> >
> > Regarding DMA problems: I think that these are solved for the
> > PVR500. I haven't yet done a REALLY long duration test but from the
> > shorter tests I did it is looking good. The DMA errors still occur
> > for other cards: it is a hardware issue with the cx23415/6 and
> > there probably isn't anything I can do about it. Just don't use CPU
> > freq. changers and sometimes using a RAID array also messes up the
> > DMA.
> >
> > The reason that it works for the PVR500 is that the PVR500 has a
> > PCI bridge that seems to isolate the cx23416 chips from the main
> > PCI bus. It still could fail on the 0.9 drivers due to the way DMA
> > was handled in the driver. With the new trunk driver all DMA is now
> > done in the interrupt handler.
> >
> > Note: ivtv trunk requires the 2.6.19 kernel. It is probably very
> > easy to backport it to 2.6.18, it may even compile out of the box.
> > I just haven't tested it myself. When this driver version is
> > released I'll definitely backport it to 2.6.18.
> >
> > The trunk driver can be obtained here:
> >
> > http://ivtvdriver.org/viewcvs/ivtv/trunk.tar.gz?view=tar
>
> Great work Hans. Shame I don't have a machine with a 2.6.19 kernel
> running.
>
> How much of this might be backportable to the 0.4.x branch? Testing
> 0.4.9 at present at it seems to work well on my setup, but I'd like
> to reduce the DMA issues further.
All I can say is that I'm not going to backport this to 0.4.x. I have to
make choices where I spend my time, and backporting simply takes too
much time. It's not a trivial thing to do. But if someone else would be
willing to take this on, then I'm happy to help out.
Hans
_______________________________________________
ivtv-devel mailing list
[email protected]
http://ivtvdriver.org/mailman/listinfo/ivtv-devel
